Cannot connect to existing Realm

Have existing Realms world, click to connect and it starts with standard load message, gets to loading resource packs, hangs, then gives me a "Unable to connect to the world" message. No other information available. Has been doing since around noon. I have another Realms world that I am able to connect to. I have downloaded the backup of when I was last in, and it works fine, no issues with the file. I have also closed and opened back up, and restarted the computer.